The QTextFragment class holds a piece of text in a QTextDocument 采用单 QTextCharFormat . 更多...
| 头： | #include <QTextFragment> |
| qmake: | QT += gui |
注意： 此类的所有函数 可重入 .
| QTextFragment () | |
| QTextFragment (const QTextFragment & other ) | |
| QTextCharFormat | charFormat () const |
| int | charFormatIndex () const |
| bool | contains (int position ) const |
| QList<QGlyphRun> | glyphRuns (int pos = -1, int len = -1) const |
| bool | isValid () const |
| int | length () const |
| int | position () const |
| QString | text () const |
| bool | operator!= (const QTextFragment & other ) const |
| bool | operator< (const QTextFragment & other ) const |
| QTextFragment & | operator= (const QTextFragment & other ) |
| bool | operator== (const QTextFragment & other ) const |
The QTextFragment class holds a piece of text in a QTextDocument 采用单 QTextCharFormat .
A text fragment describes a piece of text that is stored with a single character format. Text in which the character format changes can be represented by sequences of text fragments with different formats.
If the user edits the text in a fragment and introduces a different character format, the fragment's text will be split at each point where the format changes, and new fragments will be created. For example, changing the style of some text in the middle of a sentence will cause the fragment to be broken into three separate fragments: the first and third with the same format as before, and the second with the new style. The first fragment will contain the text from the beginning of the sentence, the second will contain the text from the middle, and the third takes the text from the end of the sentence.
A fragment's text and character format can be obtained with the text () 和 charFormat () 函数。 length () function gives the length of the text in the fragment. position () gives the position in the document of the start of the fragment. To determine whether the fragment contains a particular position within the document, use the contains () 函数。
另请参阅 QTextDocument and 富文本文档结构 .
Creates a new empty text fragment.
Copies the content (text and format) of the other text fragment to this text fragment.
Returns the text fragment's character format.
另请参阅 text ().
Returns an index into the document's internal list of character formats for the text fragment's character format.
另请参阅 QTextDocument::allFormats ().
返回
true
if the text fragment contains the text at the given
position
in the document; otherwise returns
false
.
Returns the glyphs corresponding to len characters of this text fragment starting at position pos . The positions of the glyphs are relative to the position of the QTextBlock 's layout.
若 pos is less than zero, it will default to the start of the QTextFragment 。若 len is less than zero, it will default to the length of the fragment.
另请参阅 QGlyphRun , QTextBlock::layout (), QTextLayout::position ()，和 QPainter::drawGlyphRun ().
返回
true
if this is a valid text fragment (i.e. has a valid position in a document); otherwise returns
false
.
Returns the number of characters in the text fragment.
另请参阅 text ().
Returns the position of this text fragment in the document.
Returns the text fragment's as plain text.
另请参阅 length () 和 charFormat ().
返回
true
if this text fragment is different (at a different position) from the
other
text fragment; otherwise returns false.
返回
true
if this text fragment appears earlier in the document than the
other
text fragment; otherwise returns
false
.
Assigns the content (text and format) of the other text fragment to this text fragment.
返回
true
if this text fragment is the same (at the same position) as the
other
text fragment; otherwise returns
false
.
